That hack is courtesy of Mr GXBlock. You can download it here. You can find it as well other GXBlock hacks at the gplugs site.

I do not know what version of Geeklog this hack was designed for. It consists of replacing COM_siteHeader with a customized version. The hack is only a few lines of code added to COM_siteHeader, though. I would just add those lines to the current function, rather than replacing the whole thing. If you get it working would you let me know of any changes required and for what version of geeklog and I will make the changes to cvs.